[en] Chronic cold exposure is detrimental to chill susceptible insects that may accumulate chill injuries. To cope with deleterious effects of cold temperature, insects employ a variety of physiological strategies and metabolic adjustments, such as production of cryoprotectants, or remodeling of cellular membranes. Cold tolerance is a key element determining the fundamental niche of species. Because Drosophila suzukii is an invasive fruit pest, originating from East Asia, knowledge about its thermal biology is urgently needed. Physiological mechanisms underlying cold tolerance plasticity remain poorly understood in this species. Here, we explored metabolic and lipidomic modifications associated with the acquisition of cold tolerance in D. suzukii using Omics technologies (LC- and GC-MS/MS). In both cold-acclimated males and females, we observed physiological changes consistent with homeoviscous/homeophasic adaptation of membranes: reshuffling of phospholipid head groups and increasing unsaturation rate of fatty acids. Modification of fatty acids unsaturation were also observed in triacylglycerides, which would likely increase accessibility of lipid reserves. At the metabolic level, we observed clear-cut differentiation of metabolic profiles with cold-acclimated metabotypes showing accumulation of several potential cryoprotectants (sugars and amino acids). Metabolic pathway analyses indicated a remodeling of various processes, including purine metabolism and aminoacyl tRNA biosynthesis. These data provide a large-scale characterization of lipid rearrangements and metabolic pathway modifications in D. suzukii in response to cold acclimation and contribute to characterizing the strategies used by this species to modulate cold tolerance.
Disciplines :
Entomology & pest control Anatomy (cytology, histology, embryology...) & physiology Environmental sciences & ecology
Author, co-author :
Enriquez, Thomas ; Université de Liège - ULiège > Département GxABT > Gestion durable des bio-agresseurs ; Université Rennes 1, Centre National de la Recherche Scientifique , Rennes , France
Colinet, Hervé; Université Rennes 1, Centre National de la Recherche Scientifique , Rennes , France
Language :
English
Title :
Cold acclimation triggers lipidomic and metabolic adjustments in the spotted wing drosophila Drosophila suzukii (Matsumara).
Publication date :
01 June 2019
Journal title :
American Journal of Physiology - Regulatory Integrative and Comparative Physiology
ANR - Agence Nationale de la Recherche FWF - Austrian Science Fund
Funding text :
This work has been funded by the SUZUKILL project (The French National Research Agency: ANR-15-CE21-0017 and the Austrian Science Fund, FWF:I 2604-B25).
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